Object Mode shows odd Jitter on Mesh?
If there are no mesh issues, overlapping faces etc. and it also appears when creating new faces, try the following:
In 3D Viewport, press N, to open the Sidebar, go to View &gt; Clip Start / End and change the values to e.g. 0.001 and 1000.
Sometimes these issues appear when you have imported an object which is very large or very small in Blender because of different unit systems or similar reasons, and when you are zooming in or out on the object or change the clipping to make it visible this strange behaviour can occur.
Not sure if this is the case with your file, but I get this error every once in a while.